Outer surface of the bottom portion of a barbeque grill



FIG. 1 is a perspective view of an outer surface of the bottom portion of a barbeque grill showing our new design;

FIG. 2 is a side elevational view thereof, the other sides being identical; and,

FIG. 3 is a bottom plan view thereof.

The details shown in broken lines in figures 1 and 2 are shown for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for an outer surface of the bottom portion of a barbeque grill. 